Pakk. — Marine Tertiaries of Otago and Canterbury. 493 



The Motanau beds, containing some 70 per cent, of living 

 forms, rest unconformable' upon the Mount Brown beds, as 

 will be shown later on. They contain none of the large 

 extinct molluscs which characterize the Pareora and Awamoa 

 beds. 



The Pareora beds are nowhere seen to overlie the Wai- 

 taki Stone, not even in the typical sections at Pareora and 

 Awamoa. At these places, unfortunately, the sections are so 

 obscure that the relationships cannot be determined. 



In the Waihao district the Mount Harris beds, assigned 

 by Captain Hutton and the Geological Survey to the Pareora 

 series, rest not upon the Waitaki Stone, which is present 

 everywhere, but upon the Lower Mesozoic basement rocks. 

 The meaning of this is somewhat significant. 



The sections at Hampden, Kakanui, Enfield, Wharekuri, 

 Waihao Forks, and Kakanui afford conclusive evidence of 

 the inferior position of beds which are admitted by Captain 

 Hutton to contain the Pareora fauna, and supply a satisfac- 

 tory solution of the problem at Mount Harris. 



The typical Hutcbinson Quarry beds are exposed at the old 

 quarry of that name near the Town of Oamaru. Here they 

 form a small isolated patch obscured by a thick deposit of 

 the Oamaru silts. They are intercalated with tuffs, and them- 

 selves consist of yellowish-coloured calcareous sands and thin 

 bands of limestone. The Oamaru building-stone is absent in 

 this neighbourhood, and consequently the relationship exist- 

 ing between the Hutchinsou Quarry beds and that horizon 

 cannot be determined in the typical locality. Captain Hut- 

 ton includes the Hutchinson Quarry beds in his Oamaru 

 series, but the Geological Survey assumes that they overlie 

 the Waitaki Stone and belong to a younger series. The 

 underlying beds are not exposed, and the Waitaki Stone is 

 absent, consequently there is nothing to indicate to w T hat 

 horizon the quarry-beds should be referred. Whatever evi- 

 dence there is tends to show that they belong to the period of 

 volcanic activity which preceded the deposition of the Oamaru 

 Stone, for volcanic activity which commenced in the Oamaru 

 district towards the close of the Waihao greensand period 

 culminated during the deposition of the Hutchinson Quarry 

 beds and ceased before the deposition of the Waitaki Stone. 

 The Hutchinson Quarry beds possess no value for correlative 

 purposes, since their stratigraphical position can only be as- 

 certained by reference to sections elsewhere. The sections 

 north of the mouth of the Kakanui River, Cape Oamaru, and 

 Teschemaker's clearly correlate the Hutchinson Quarry beds 

 with the horizon which underlies the Waitaki Stone. The beds 

 of this horizon have been generally known as the Hutchinson 

 Quarry or Mount Brown beds. In the present classification 



